this is a challenge from hackerrank https://www.hackerrank.com/challenges/jumping-on-the-clouds-revisited/problem?isFullScreen=true

jumping-on-the-clouds.js

function jumpingOnClouds(c, k) {
  let index = 0;
  let energy = 100;
  let stop = false;

  while (!stop) {
    if (c[index] === 1) {
      energy -= 2;
    }

    energy -= 1;
    index = (index + k) % c.length;
    
    if (index === 0) {
      stop = true;
    }
  }

  return energy;
}